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LONG-TERM DEBT (Details) $ / shares in Units, ¥ in Millions |  |  |  | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2021 | Sep. 19, 2016 USD ($) $ / shares | Jun. 18, 2015 USD ($) $ / shares | Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jul. 31, 2021 USD ($) | Jul. 13, 2020 USD ($) $ / shares | Jul. 01, 2020 CNY (¥) | Jul. 01, 2020 USD ($) | Aug. 31, 2019 CNY (¥) | Aug. 31, 2019 USD ($) | Sep. 12, 2016 USD ($) $ / shares
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes |  |  |  | ¥ 13,144 |  | ¥ 6,644 |  |  |  |  |  |  |  |  |  |
Securitization debt |  |  |  | 0 |  | 628 |  |  |  |  |  |  |  |  |  |
Total |  |  |  | 13,177 |  | 11,093 |  | $ 1,911,000,000 |  |  |  |  |  |  |  |
Fair value of long-term debt, based on Level 2 inputs |  |  |  | 13,200 |  | 11,100 |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  | 13,100 |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt |  |  |  | 4,100 |  |  |  |  |  |  |  |  |  |  |  |
Exchangeable Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt |  |  |  | ¥ 4,204 |  |  |  |  |  |  |  |  |  |  |  |
Long-term Loans from Commercial Banks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate (as a percent) |  |  |  | 3.06% |  |  |  | 3.06% |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | ¥ 17,200 |  |  |  | $ 2,500,000,000 |  |  |  |  |  |  |  |
2025 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes |  |  |  | 33 |  | 30 |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 1.99% |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  | ¥ 2,800 | $ 395,000,000 |  |  |
Debt issuance costs | $ |  |  | 6,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  | 33 |  |  |  |  |  |  |  |  |  |  |  |
2025 Notes | ADS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount denomination for conversion | $ |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion rate |  |  | 9.3555 |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares |  |  | $ 106.89 |  |  |  |  |  |  |  |  |  |  |  |  |
2022 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ |  | $ 975,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early Redemption For Cash |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 6,600 | $ 924,000,000 |
Debt issuance costs | $ |  | 19,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed for cash |  |  |  | 363 |  |  |  | 51,000,000 |  |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  | 324 |  |  |  |  |  |  |  |  |  |
Repayments of short-term debt |  |  |  | 363 | $ 51,000,000 |  |  |  |  |  |  |  |  |  |  |
2022 Notes | ADS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount denomination for conversion | $ |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion rate |  | 15.2688 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares |  | $ 65.49 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2022 Booking Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.25%
Aggregate principal amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000
Principal amount redeemed for cash |  |  |  | 178 |  |  |  | 25,000,000 |  |  |  |  |  |  |  |
Short-term Debt |  |  |  |  |  | 159 |  |  |  |  |  |  |  |  |  |
2022 Booking Notes | ADS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 65.49
Exchangeable Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes |  |  |  | 0 |  | 3,791 |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 1.50% |  |  |  |  |
Fair value of long-term debt, based on Level 2 inputs |  |  |  | 4,200 |  | 3,800 |  | $ 609,000,000 | $ 595,000,000 |  |  |  |  |  |  |
Aggregate principal amount | $ |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |
Exchangeable Senior Notes [Member] | Other Income Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Changes in fair value of long term debt |  |  |  | ¥ (97) | $ (14,000,000) | ¥ 363 | $ 56,000,000 |  |  |  |  |  |  |  |  |
Exchangeable Senior Notes [Member] | ADS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount denomination for conversion | $ |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |
Initial conversion rate | 24.7795 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 40.36 |  |  |  |  |

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